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Good start overall, though take it easy on the settings.
On the first photo, there’s a fantastic sense of speed, and overall, this is your best photo. The only thing that lets it down, is the point of focus should be the front of the car, not the rear.
The second photo has some nice composition, though the brightness/exposure and the vignette are too high. There also doesn’t seem to be much of a sense of speed, which would compliment the photo well.
I like the reflections on the track on the third photo, and again the composition is good, though try aiming the camera down a little to get the photo in line with the rule of thirds.
I like the idea of the fourth photo, but it would work much better if you were looking down on the car, rather than the rear.
On the fifth photo, again. Far too much aperture/vignette.
I like the composition on the sixth photo, but the exposure is too high.
Keep those points in mind, and I look forward to seeing the next batch 
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few more added
This one’s cool! -;
1st, 3rd, and 4th shots are pretty cool!
I would continue to work with your settings though and maybe attempt to add more color or flair to them. Looking forward to more.
I Like the sense of speed in the first photo. But I think it’s better to move your camera a bit so the Forza logo don’t touch the car. Or maybe you can flip it so the logo is on the bottom of your shot.